<template>
    <div>
       <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
        <el-row>
            <el-col>
                <el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
            </el-col>
        </el-row>
        <!-- 表格 -->
    <tree-table class="treeTable" :data="catelist" :columns="columns" :selection-type="false"
    :expand-type="false" show-index border>
    <!-- 是否有效 -->
        <template  v-slot:isok="scope">
            <i class="el-icon-success" v-if="scope.row.cat_deleted ===false" style="color:lightgreen;"></i>
            <i class="el-icon-error" v-else style="color:red;"></i>        
        </template>
    <!-- 排序 -->
    <template v-slot:order="scope">
        <el-tag size="mini" v-if="scope.row.cat_level===0">一级</el-tag>
        <el-tag size="mini" type="success" v-else-if="scope.row.cat_level===1">二级</el-tag>
        <el-tag size="mini" type="warning" v-else>三级</el-tag>    
    </template>
    <!-- 操作 -->
    <template v-slot:opt="scope">
       <el-button type="primary" size="mini" icon="el-icon-edit">编辑</el-button>
       <el-button type="danger" size="mini"  icon="el-icon-delete">删除</el-button>
    </template>
    </tree-table>
        <!-- 分页区域 -->
    <el-pagination
      @size-change="handleSizeChange"
      @current-change="handleCurrentChange"
      :current-page="queryInfo.pagenum"
      :page-sizes="[3,5,10,15]"
      :page-size="queryInfo.pagesize"
      layout="total, sizes, prev, pager, next, jumper"
      :total="total">
    </el-pagination>    
    </el-card>
    <!-- 添加分类的对话框 -->
    <el-dialog
  title="添加分类"
  :visible.sync="addCateDialogVisible"
  width="50%"
  @close="addCateDialogClosed">
  <!-- 添加分类的表单 -->
  <el-form :model="addCateForm" :rules="addCateFormRules" ref="addCateFormRef" label-width="100px" >
  <el-form-item label="分类名称：" prop="cat_name">
    <el-input v-model="addCateForm.cat_name"></el-input>
  </el-form-item>
  <el-form-item label="父级分类：" >
      <el-cascader
    v-model="selectedKeys"
    :options="parentCatelist"
    :props="cascaderProps"
    @change="parentCateChange"
    clearable
    ></el-cascader>
  </el-form-item>
  </el-form>
  <span slot="footer" class="dialog-footer">
    <el-button @click="addCateDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addCate">确 定</el-button>
  </span>
</el-dialog>
    </div>
</template>

<script>

export default {
    data(){
        return{
            // 商品分类的数据
            catelist:[],
            // 查询条件
            queryInfo:{
                type: 3,
                pagenum:1,
                pagesize:5
            },
            // 总数据条数
            total:0,
            // 为table指定列的定义
            columns:[{
                label:'分类名称',
                prop:'cat_name'
            },{
                label:"是否有效",
                type:"template",
                template:"isok"
            },{
                label:"排序",
                type:"template",
                template:"order"
            },{
                label:"排序",
                type:"template",
                template:"opt"
            }
            ],
            addCateDialogVisible:false,
            // 添加分类表单的数据对象
            addCateForm:{
                cat_name:'',
                cat_pid:0,
                cat_level:0,
            },
            // 添加分类表单的验证规则对象
            addCateFormRules:{
                cat_name:[
                    {required:true,message:'请输入分类名称',trigger:'blur'}
                ]
            },
            parentCatelist:[],
            cascaderProps:{
                expandTrigger: 'hover',
                value:'cat_id',
                label:'cat_name',
                children:'children',
                checkStrictly:true
            },
            selectedKeys:[],

        }
    },
    created(){
        this.getCatelist()
    },
    methods:{
        async getCatelist(){
            const {data:res} = await this.$http.get('categories',{params:this.queryInfo})
            if(res.meta.status !==200){
                return this.$message.error('获取商品分类失败!')
            }
            this.catelist = res.data.result
            this.total = res.data.total
            // console.log(res);
        },
        // 监听pagesize改变
        handleSizeChange(newsize){
            this.queryInfo.pagesize=newsize
            this.getCatelist()
        },
        handleCurrentChange(newnum){
            this.queryInfo.pagenum = newnum
            this.getCatelist()
        },
        showAddCateDialog(){
            this.getParentCatelist()
            this.addCateDialogVisible = true
        },
        // 获取父级分类的数据列表
        async getParentCatelist(){
            const {data:res} = await this.$http.get('categories',{params:{type : 2}})
            // console.log(res.data);
            if(res.meta.status !== 200){
            return this.$message.error('获取父级商品分类失败')
            }
         this.parentCatelist = res.data
        },
        // 选择项发生变化触发这个函数
        parentCateChange(){
            // console.log(this.selectedKeys);            
            if(this.selectedKeys.length > 0){
                this.addCateForm.cat_pid = this.selectedKeys[this.selectedKeys.length-1]
                this.addCateForm.cat_level = this.selectedKeys.length
                return
            }
            else{
                this.addCateForm.cat_level = this.selectedKeys = 0
            }
        },
        // 点击按钮添加新的分类
        addCate() {
            console.log(this.addCateForm);
            this.$refs.addCateFormRef.validate(async valid =>{
                if(!valid) return
                const{data:res} = await this.$http.post('categories',this.addCateForm)
                if(res.meta.status !== 201){
                    return this.$message.error('添加分类失败！')
                }
                this.$message.success('添加分类成功！')
                this.getCatelist()
                this.addCateDialogVisible = false
            })
        },
         //监听对话框的关闭事件
        addCateDialogClosed(){
            this.selectedKeys =[]
            this.$refs.addCateFormRef.resetFields()
            this.addCateForm.cat_level = 0
            this.addCateForm.cat_pid = 0
        }
    }
}
</script>

<style lang="less" scoped>
    .treeTable {
        margin-top: 15px;
    }
    .el-cascader {
        width: 100%;
    }
</style>